<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      (function () {
        /*
        字符串模板 ``  
      */
        let a = 'a';
        let b = 'b';
        let str = `有个${a}, 有个 ${b}`;
        console.log(str); //有个a,有个b
      })();
    </script>
  </body>
</html>
